Toyo Ink Manufacturing Company

Toyo Ink Mfg. Co., Ltd.

Tadashi Itabashi

Takashi Kamikubo

Atsushi Endo

Akimitsu Mochizuki

Masami Kuwahara

Katsuhiko Sawamura

Shinichiro Maki

Masami Kuwabara

Naohisa Hirota

Daisuke Nakasone

The present invention provide an aqueous type pigment dispersing agent having one portion which has a high affinity with a pigment and which has at least one type of selected from the group consisting of an organic dye, anthraquinone and acridone and only at a terminal end or at both terminal ends of at least one aqueous polymer selected from an aqueous linear urethanic polymer and an aqueous linear acrylic polymer, a pigment composition using the same and a pigment dispersion. The portion having a high affinity with the pigment can be adsorbed efficiently on the surface of a pigment. At the same time, for example, a pigment, used for ink or paint can be dispersed stably due to the affinity between the polymer portion and a disperse medium to improve the adaptability in use and the quality of coating articles.

Pigment dispersing agent, composition containing the same, and aqueous

Coating composition

A method is disclosed for dispersing a pigment to obtain a pigment dispersion. The method involves dispersing 100 parts by weight of a pigment, 0.1 to 30 parts by weight of a specific pigment dispersing agent and 5 to 300 parts by weight of a water-based resin in 100 to 2,000 parts by weight of an aqueous medium having a water-soluble organic solvent concentration of 4 to 15% by weight. Pigments are obtained which are suitable for the production of water-based coating compositions or water-based inks excellent in fluidity, storage stability, gloss of a coating, sharpness and tinting strength.

Method for dispersing pigment and water-based pigment dispersion

Growing community of inventors

Tokyo, Japan

Tadashi Itabashi